Structure of fan

ABSTRACT

The present invention relates to an improved fan structure used for a heat sink, and such fan comprises an axle having a first fan member and a second fan member coupled to each end of the axle, and a plurality of leaves arranged in opposite directions are disposed on the first and second fan members such that when the fan is in use, the first fan member is installed onto a heat sink and the second fan member deeply embedded into the heat sink. The hot air conducted to the heat sink is drawn and discharged by the leaves in opposite directions such that the cold air drawn by the leaves of first fan member blows towards the fins of the heat sink to accomplish the convection of the outside cold air and the hot air from the heat sink, which can accelerate the discharge of the hot air.

BACKGROUND OF THE INVENTION

[0001] 1. Field of the Invention

[0002] The present invention relates to an improved structure of a fan, more particularly to an improved fan structure using the same axis for the rotation in the same direction of a first fan member and a second fan member with their leaves arranged in opposite directions in order to generate a convection between the hot air conducted to the first fan member and the second fan member rotating in the same direction and the cold air outside, and hence the hot air on the heat sink can be dispersed quickly to the air.

[0003] 2. Description of the Prior Art

[0004] Please refer to FIG. 1 for the prior-art fan structure, which comprises a frame (not shown in the figure) having an axle 100, and a plurality of leaves 120 being arranged in the same direction and embedded on the periphery of the axle 100. Please refer to FIG. 2. When the fan is in use, a CPU 200 (such as the CPU adopting Socket 370, Socket 7, and Socket 462, etc.) is installed to a motherboard first, then a heat sink 400 is installed on the CPU 200, and a frame 410 is mounted onto the heat sink 400. A fan facing the heat sink 400 is disposed on the top of the frame 410 such that the cold air can be drawn from the outside towards the heat sink 400, and the heat of the CPU 200 is dispersed by means of the conduction of the heat sink and the rotation of the leaves 110 driven by the axle 100. However, the fan only has a set of leaves 110 arranged in the same direction, and the leaves 110 are disposed on the top of the heat sink 400, therefore while the cold air outside is blowing at the heat sink 400, the hot air from the heat sink 400 can only be dispersed by natural convection and flows towards the open end of the heat sink 400 in order to discharge the heat out of the heat sink 400. The hot air gathered at the center of the CPU flows very slowly, and compresses the air drawn into the heat sink. The air cannot successfully move to the outside but stays on the heat sink that makes the heat dispersion very slowly.

[0005] In view of the shortcomings of the prior art mentioned above, the inventor of the present invention based on years of experience accumulated from the engagement in the related industry conducted extensive research to resolve the foregoing shortcomings and invented the fan structure of the present invention.

[0006] Therefore, the primary objective of the present invention is to provide an improved structure of a fan used for a heat sink, and such fan comprises an axle having a first fan member and a second fan member coupled to each end of the axle, and a plurality of leaves arranged in opposite direction are disposed on the first and second fan members such that when the fan is in use, the first fan member is installed onto a heat sink and the second fan member deeply embedded into the heat sink. The hot air conducted to the heat sink is discharged from the first and the second leaves that are arranged in opposite directions. The hot air of the heat sink is drawn and discharged out of the heat sink so that the cold air drawn by the first leave blows towards the fin of the heat sink to accomplish the convection of the outside cold air and the hot air from the heat sink. Such arrangement accelerates the discharge of the hot air.

[0007] To make it easier for our examiner to understand the objective of the invention, structure, innovative features, and performance, we use a preferred embodiment together with the attached drawings for the detailed description of the invention.

BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Other objects, features, and advantages of the invention will become apparent from the following detailed description of the preferred but non-limiting embodiment. The description is made with reference to the accompanying drawings, in which:

[0009]FIG. 1 shows the three-dimensional structure of a prior-art fan.

[0010]FIG. 2 shows the cross-section of a prior art fan when it is in use.

[0011]FIG. 3 shows the three-dimensional structure of a fan according to the present invention.

[0012]FIG. 4 shows the three-dimensional disassembled structure of the present invention.

[0013]FIG. 5 shows the cross-section of a fan according to a preferred embodiment of the present invention when it is in use.

DESCRIPTION OF THE PREFERRED EMBODIMENT

[0014] Please refer to FIGS. 3 and 4 at the same time, these diagrams show an improved structure of a fan 10 used for a heat sink, and such fan 10 comprises an axle 11 having a first fan member 20 and a fan base 21 being disposed on the first fan member 20, and a plurality of leaves 22 being extended outward, kept at a specific distance, and embedded around the periphery of the fan base 21. The leaves 22 are bent in the same direction and will rotate in a specific direction according to the rotation of the fan base 21. Further, a second fan member 30 with an area smaller than the first fan member 20 is coupled to the other end of the axle 11. A second fan base 31 is disposed on the second fan member 30, and a plurality of leaves 32 being extended outward, kept at a specific distance, bent into the same direction, and embedded around the periphery of the fan base 31. The leaves 22 of the first fan member 20 and the leaves 32 of the second fan member 30 are bent into opposite directions but the direction of the rotation of the axle 11 is the same.

[0015] Please refer to FIG. 5 for the fan structure of the present invention is in use. A heat sink 40 is disposed on a CPU 50 first (this embodiment is a socket 370 CPU installed on the motherboard 60 or other CPU of similar structure), and then a fan 10 is mounted onto the heat sink 40 on the side other than that attached on the surface of the CPU 50. A first fan member 20 and a second fan member 30 are disposed on the same axle of the fan 10, and the leaves 22, 32 of the first and the second fan members are in the opposite directions, wherein the second fan member 30 deeply penetrates into a hollow cylindrical member 12 of the heat sink 40. The hot air generated by the CPU 50 is conducted to the heat sink 40 and is gathered at the center of a pillar 41. In the meantime, the heat is conducted from the pillar 41 to the periphery of the cylindrical member 12 and the fins 42 that are not in touch with the base of the heat sink 40. During the heat conduction process, the heat will not stay on the heat sink 40, but will be spread to the air very quickly via the outwardly extended fins 42. Meanwhile, the cold air from the outside will be blown towards the fins 42 by means of the first fan member 20, and the hot air conducted to the heat sink 40 can enter the pillar 41 via holes 411 on the pillar 41 and deep in side the pillar 41, and then drawn outside the second fan member 30 such that it generates a convection to the air in the heat sink 40 and accelerates the heat dispersion.

[0016] Furthermore, it is worth to note that when the first fan member 20 blows the cold air from the outside towards the fins 42, it naturally generates suction to the hot air in the pillar 41. In addition, the leaves 22 of the first fan member 20 are larger than the leaves 32 of the second fan member 30, therefore they generate a more powerful blow when the fans rotate, and strengthen to suck the hot air from the inside of the pillar 41, which totally complies with the principles of thermodynamics and fluid mechanics.

[0017] Therefore, in summation of the above description, the present invention meets the requirements of patentability, which is hereby submitted for patent application.

[0018] While the invention has been described by way of example and in terms of a preferred embodiment, it is to be understood that the invention is not limited thereto. To the contrary, it is intended to cover various modifications and similar arrangements and procedures, and the scope of the appended claims therefore should be accorded the broadest interpretation so as to encompass all such modifications and similar arrangements and procedures. 

What is claimed is:
 1. An improved structure of a fan, comprising: an axle; a first fan member, being pivotally coupled to an end of the axle, and having a plurality of leaves arranged in the same direction and the leaves are kept apart from each other with a specific distance; a second fan member, being pivotally coupled to another end of the axle, having a plurality of leaves arranged in the opposite direction to the leaves on the first fan member, and the leaves of the second fan member are kept apart from the leaves of the first fan member with a specific distance such that the leaves do not collide with each other when the first and the second fan members rotate, and when the fan is in use, the first fan member is installed on the heat sink, and the second fan member deeply penetrates into the heat sink to enable the hot air in the heat sink be drawn out by the second fan member and then discharged by the first fan member, and the first fan member blows the cold air from outside towards the fin of the heat sink such that the air of the heat sink and the outside air produce a convection to accelerate the heat dispersion.
 2. An improved structure of a fan as claimed in claim 1, wherein said second fan member has a smaller area than that of the first fan member. 